Cut ter roof failurede Hill, John L.MateriasMine roof controlRock deformationEdiciones (1)Cut ter roof failure (1986)U.S. Dept. of the Interior, Bureau of Mines · inglésMás obras de Hill, John L.The Congress and Indian nationalismCCongress and Indian NationalismCongress and Indian NationalismCCase for VegetarianismCase for Vegetarianism